DYES AND PIGMENTS USED IN THE PREPARATION OF THE MAXWELL DISKS, REPRESENTING THE THIRTY-SIX COLORS OF THE PURE SPECTRUM SCALE, FORMING THE BASIS OF THE COLOR-SCHEME OF THIS WORK.[1]
Red.—Devoe's geranium lake (dry), its orange hue neutralized by a wash of rhodamin b. (Crocein scarlet b. washed with rhodamin b. produces practically the same fine red.)
Hues between red and orange.—Crocein scarlet b. with gold orange.
Orange.—Gold orange with orange g.
Hues between orange and yellow.—Orange g. with auramin.
Yellow—Auramin, rather dilute. (The best substitute among pigments is a fine quality of zinc yellow, as Hatfield's.)
Hues between yellow and green. — Auramin washed with light green.
Green.—Auramin (very dilute) washed with light green. (The auramin should be applied first, because it "sets" or becomes fast quickly, while the light green does not, but is largely removed by over washes of the yellow, thus rendering it very difficult to get the desired hue.)
Hues between green and blue.—Methyl green; the same washed with light blue (Diamond Dye); for the hues nearer blue, light blue washed with Winsor and Newton's permanent blue or new blue (the least violet-hued of the artificial ultramarines).
Blue.—Light blue washed with permanent blue or new blue. (Although the color is nearer that of the artificial ultramarines named, it is useless to apply the latter first,
- ↑ The aniline or coal-tar dyes named are all of the manufacture of Dr. G. Grubler and Co., Leipzig, Germany, unless otherwise stated. (See Preface, page ii.)
